Question

我想让计算器只能用键盘工作。如果我在textbox1上按（+， - ，，/），我想对组合框做出反应但问题是当我按下键盘上的（+， - ，，/）时，它不起作用。我该如何解决这个问题？

private void button1_Click(object sender, EventArgs e)
    {
        if (comboBox1.SelectedItem.ToString() == "+")
        {
            int tmp = int.Parse(textBox1.Text) + int.Parse(textBox2.Text);
            textBox3.Text = tmp.ToString();
        }
        if (comboBox1.SelectedItem.ToString() == "-")
        {
            int tmp = int.Parse(textBox1.Text) - int.Parse(textBox2.Text);
            textBox3.Text = tmp.ToString();
        }
        if (comboBox1.SelectedItem.ToString() == "*")
        {
            int tmp = int.Parse(textBox1.Text) * int.Parse(textBox2.Text);
            textBox3.Text = tmp.ToString();
        }
        if (comboBox1.SelectedItem.ToString() == "/")
        {
            int tmp = int.Parse(textBox1.Text) / int.Parse(textBox2.Text);
            textBox3.Text = tmp.ToString();
        }

    }

    private void Form1_Shown(object sender, EventArgs e)
    {
        textBox1.Focus();
    }

    private void textBox1_KeyDown(object sender, KeyEventArgs e)
    {
        if (e .KeyCode == Keys.Add )
        {
            comboBox1.Text = "+";
            textBox2.Focus();
            textBox2.SelectAll();
        }
        if (e .KeyCode == Keys.Subtract )
        {
            comboBox1.Text = "-";
            textBox2.Focus();
            textBox2.SelectAll();
        }

        if (e .KeyCode == Keys.Multiply )
        {
            comboBox1.Text = "*";
            textBox2.Focus();
            textBox2.SelectAll();
        }

        if (e .KeyCode == Keys.Divide )
        {
            comboBox1.Text = "/";
            textBox2.Focus();
            textBox2.SelectAll();
        }



    }

    private void textBox2_KeyDown(object sender, KeyEventArgs e)
    {
        if (e .KeyCode == Keys.Enter )
        {
            this.button1_Click(sender, e);
            textBox1.Focus();
            textBox1.SelectAll();
        }
    }
}

我想只在键盘上工作，当我在textbox1上按（+， - ，*，/）时，焦点需要改变comboBox去textbox2。

in order, textBox1, comboBox1, textBox2, button, textBox3

Answer 1

只有当您从键盘的小键盘上发送+,-,*,/时，您的代码才有效。将您的textBox1_KeyDown更改为textBox1_KeyPress事件。这使您能够从键盘（+,-,*,/）检查输入字符：

private void textBox1_KeyPress(object sender, KeyPressEventArgs e)
{
    if (e.KeyChar == '+')
    {
        comboBox1.Text = "+";
        textBox2.Focus();
        textBox2.SelectAll();
    }
    else if (e.KeyChar == '-')
    {
        comboBox1.Text = "-";
        textBox2.Focus();
        textBox2.SelectAll();
    }
    else if (e.KeyChar == '*')
    {
        comboBox1.Text = "*";
        textBox2.Focus();
        textBox2.SelectAll();
    }
    else if (e.KeyChar == '/')
    {
        comboBox1.Text = "/";
        textBox2.Focus();
        textBox2.SelectAll();
    }
}

我怎样才能使用计算器只在键盘上使用keys.add

1 个答案: